Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.
A196969
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =10a(2) =34a(3) =104a(4) =386a(5) =1380a(6) =4800a(7) =16794a(8) =58875a(9) =206084a(10) =721260a(11) =2525126a(12) =8840855a(13) =30952194a(14) =108366098a(15) =379400544a(16) =1328316102a(17) =4650549495a(18) =16281977271a(19) =57004611828a(20) =199578061611a(21) =698740003512
External references
- oeis: A196969